<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="app">
        <div>
            <div style="display: inline-block" v-for="(item,index) in arr" >
                <input type="checkbox" v-model="newArr" :value="item" @click="add(item)" />
                <span>{{item}}</span>
            </div>
           
            <p>你选中的元素, 累加的值和为: {{total}}</p>
        </div>
    </div>
    <script src="./vue.js"></script>
    <script>
      
        const app = new Vue({
            el: '#app',


        
            data: {

                arr: [9, 15, 19, 25, 29, 31, 48, 57, 62, 79, 87],
                newArr:[],
                total:''

            },
            methods:{
                add(newItem) {
                    this.newArr.push(newItem)
                    this.total = this.newArr.reduce((sum,item) =>
                     {return sum + item}
                     ,0)
                }
            }
            

        })
    </script>

    

</body>

</html>